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#1
February 27th 06, 12:11 PM
posted to rec.radio.amateur.antenna
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antenna impedance - calculated 10 - 20 Ohms - measured 36 Ohms??
dansawyeror wrote:
4nec2 predicts an impedance of between 10 and 20 ohms depending of the assumed values of R in the impedance loads. The actual antenna measures 36 Ohms at the feed. The question is: What is the basis of the difference between predicted and measured values? Does 4nec2 include the ground losses in the feedpoint impedance? -- 73, Cecil http://www.qsl.net/w5dxp |
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#2
February 27th 06, 01:21 PM
posted to rec.radio.amateur.antenna
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antenna impedance - calculated 10 - 20 Ohms - measured 36 Ohms??
"Cecil Moore" wrote in message t... dansawyeror wrote: 4nec2 predicts an impedance of between 10 and 20 ohms depending of the assumed values of R in the impedance loads. The actual antenna measures 36 Ohms at the feed. The question is: What is the basis of the difference between predicted and measured values? Does 4nec2 include the ground losses in the feedpoint impedance? -- 73, Cecil http://www.qsl.net/w5dxp 4nec2 does have Sommerfeld/Norton. Incidentally my NEC2 gives 15.7 + j 110.6. The 15.8 + j133 comes from NEC 4.1. Frank |
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